# ERROR: Unable to locate KNITRO installation, please check your environment variable KNITRODIR

**URL:** <https://discourse.julialang.org/t/error-unable-to-locate-knitro-installation-please-check-your-environment-variable-knitrodir/59619>\
**Category:** Optimization (Mathematical)\
**Created:** [April 19, 2021, 9:26pm UTC](https://discourse.julialang.org/t/error-unable-to-locate-knitro-installation-please-check-your-environment-variable-knitrodir/59619 "2021-04-19T21:26:37Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![yecyn](https://avatars.discourse-cdn.com/v4/letter/y/22d042/32.png) [@yecyn](https://discourse.julialang.org/u/yecyn)\
**Post date:** [April 19, 2021, 9:26pm UTC](https://discourse.julialang.org/t/error-unable-to-locate-knitro-installation-please-check-your-environment-variable-knitrodir/59619/1 "2021-04-19T21:26:37Z")

</div>

Hello,

I’ve downloaded KNITRO from Artelys, and I have unpacked the zip file and have a folder named “knitro-12.3.0-MacOS-64” under my home file.

However, while I was running the `using KNITRO` in jupyter notebook, I got the following error:

```julia
Failed to precompile KNITRO [67920dd8-b58e-52a8-8622-53c4cffbe346] to /Users/lshi/.julia/compiled/v1.6/KNITRO/jl_HkU5Zq.

Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] compilecache(pkg::Base.PkgId, path::String, internal_stderr::IJulia.IJuliaStdio{Base.PipeEndpoint}, internal_stdout::IJulia.IJuliaStdio{Base.PipeEndpoint})
   @ Base ./loading.jl:1360
 [3] compilecache(pkg::Base.PkgId, path::String)
   @ Base ./loading.jl:1306
 [4] _require(pkg::Base.PkgId)
   @ Base ./loading.jl:1021
 [5] require(uuidkey::Base.PkgId)
   @ Base ./loading.jl:914
 [6] require(into::Module, mod::Symbol)
   @ Base ./loading.jl:901
 [7] eval
   @ ./boot.jl:360 [inlined]
 [8] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
   @ Base ./loading.jl:1094

```

The I tried running `] build KNITRO`, but got the following error:

```julia
Error building `KNITRO`: 
ERROR: LoadError: Unable to locate KNITRO installation, please check your environment variable KNITRODIR.
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] top-level scope
   @ ~/.julia/packages/KNITRO/8BikX/deps/build.jl:45
 [3] include(fname::String)
   @ Base.MainInclude ./client.jl:444
 [4] top-level scope
   @ none:5
in expression starting at /Users/lshi/.julia/packages/KNITRO/8BikX/deps/build.jl:44

Stacktrace:
  [1] pkgerror(msg::String)
    @ Pkg.Types /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Types.jl:55
  [2] (::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec})()
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1040
  [3] withenv(::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, ::Pair{String, String}, ::Vararg{Pair{String, B} where B, N} where N)
    @ Base ./env.jl:161
  [4] (::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec})()
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1540
  [5] with_temp_env(fn::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec}, temp_env::String)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1442
  [6] (::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String})(tmp::String)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1515
  [7] mktempdir(fn::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String}, parent::String; prefix::String)
    @ Base.Filesystem ./file.jl:729
  [8] mktempdir(fn::Function, parent::String) (repeats 2 times)
    @ Base.Filesystem ./file.jl:727
  [9] sandbox(fn::Function, ctx::Pkg.Types.Context, target::Pkg.Types.PackageSpec, target_path::String, sandbox_path::String, sandbox_project_override::Pkg.Types.Project)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1481
 [10] build_versions(ctx::Pkg.Types.Context, uuids::Vector{Base.UUID}; verbose::Bool)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:1021
 [11] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}, verbose::Bool)
    @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Operations.jl:902
 [12] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; verbose::Bool, kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:893
 [13] build
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:877 [inlined]
 [14] #build#70
    @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:73 [inlined]
 [15] build(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/API.jl:72
 [16] do_cmd!(command::Pkg.REPLMode.Command, repl::IJulia.MiniREPL)
    @ Pkg.REPLMode /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/REPLMode/REPLMode.jl:408
 [17] do_cmd(repl::IJulia.MiniREPL, input::String; do_rethrow::Bool)
    @ Pkg.REPLMode /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/REPLMode/REPLMode.jl:386
 [18] top-level scope
    @ In[18]:1
 [19] eval
    @ ./boot.jl:360 [inlined]
 [20] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
    @ Base ./loading.jl:1094

```

It would great if someone could please help me, thank you so much!

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [April 19, 2021, 11:12pm UTC](https://discourse.julialang.org/t/error-unable-to-locate-knitro-installation-please-check-your-environment-variable-knitrodir/59619/2 "2021-04-19T23:12:04Z")

</div>

x-ref: [Error:Unable to locate KNITRO installation, please check your environment variable KNITRODIR. · Issue #184 · jump-dev/KNITRO.jl · GitHub](https://github.com/jump-dev/KNITRO.jl/issues/184). The documentation should be improved, so we will continue the discussion on Github.